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There are fields on my server's control panel like this

Minute - Hour - Day of month - Month - Day of the week - Command

How can i create a cron job runs on first day of the month with this fields ?


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Is it a PHP question or a unix cronjob question? –  powtac Nov 23 '09 at 17:34
sorry for php tag ! –  Ahmet vardar Nov 23 '09 at 17:35
RTFM, man 5 crontab in this case –  reinierpost Nov 23 '09 at 17:41
tired tired tired –  kolypto Nov 23 '09 at 23:52
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migrated from stackoverflow.com Nov 23 '09 at 20:05

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6 Answers

up vote 17 down vote accepted

This will run the command foo at 12:00AM on the first of every month

0 0 1 * * /usr/bin/foo

This article describes the various fields, look to the bottom of the page: http://en.wikipedia.org/wiki/Cron

To add this to your cron file, just use the command

crontab -e
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that looks ok i guess –  Ahmet vardar Nov 23 '09 at 17:42
can i type * instead of 0 ? –  Ahmet vardar Nov 23 '09 at 17:44
If you typed * instead of the first zero it would run every minute of the first day of the month, if you typed * for the second zero it would run every hour on the first day of the month. *'s for both would run every minute of every hour on that day. –  rzrgenesys187 Nov 23 '09 at 17:46
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Check for a directory on your server at /etc/cron.monthly. If the directory exists, odds are your system is set up to run any executables it finds in that folder on a monthly basis. Just drop your script (or symlink it) in /etc/cron.monthly. Also, make sure your script is executable.

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Will run /usr/bin/foo at 12:10am on the first day of the month.

10 0 1 * * /usr/bin/foo

Will run /usr/bin/foo at 3:10am on every day.

10 3 * * * /usr/bin/foo

See http://www.scrounge.org/linux/cron.html

updated the crons, it was a copy paste error, thanks Joy Dutta!

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3:10am every day is 10 3 * * * /usr/bin/foo 12:10am on first day of month is 10 * 1 * * /usr/bin/foo –  Joy Dutta Nov 23 '09 at 17:37
@Joy: No it's not; 10 * 1 * * is 10 past the hour, every hour, on the first day of the month. –  womble Nov 23 '09 at 20:29
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Something like:

0 0 1 * * command /directory/file.ext
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what is that 'command' and the 1 is at the month of the year place! –  Murali Nov 23 '09 at 17:36
you can do whatever you want with a cron, 99% of my usage has been: {TIMESTAMPS} {PHP_PATH} {FILE_PATH} –  Andrew G. Johnson Nov 23 '09 at 19:12
@Murali: No it's not. –  womble Nov 23 '09 at 20:30
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use following:

@monthly     /home/user/backup.sh
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Check this out: Class: PHP Cron

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